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III. § 42.] RESONATORS. 83
ventor a resonator. The best way of using it is, first to stop one ear closely, and then to insert the nipple of the instrument in the other. As often as the resonator's own note is sounded in the external air, the instrument will sing it into the ear of the obĀserver with extraordinary emphasis, and thus at once enable him to single out that note from among a crowd of others differing from it in pitch. A series of such resonators, tuned to particular previously selected notes, constitutes an invaluable apparatus for analysing a composite sound into the simple tones of which it is made up. |
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